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1. On neutrino-mediated potentials in a neutrino background

   https://doi.org/10.1007/JHEP04(2023)039  

   Blas, Diego; Esteban, Ivan; Gonzalez-Garcia, M. C.; Salvado, Jordi (April 2023, Journal of High Energy Physics)

   A bstract The exchange of a pair of neutrinos with Standard Model weak interactions generates a long-range force between fermions. The associated potential is extremely feeble, ∝ $$ {G}_F^2/{r}^5 $$ G F 2 / r 5 for massless neutrinos, which renders it far from observable even in the most sensitive experiments testing fifth forces. The presence of a neutrino background has been argued to induce a correction to the neutrino propagator that enhances the potential by orders of magnitude. In this brief note, we point out that such modified propagators are invalid if the background neutrino wavepackets have a finite width. By reevaluating the 2- ν exchange potential in the presence of a neutrino background including finite width effects, we find that the background-induced enhancement is reduced by several orders of magnitude. Unfortunately, this pushes the resulting 2- ν exchange potential away from present and near-future sensitivity of tests of new long-range forces. 

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2. Limited Archaean continental emergence reflected in an early Archaean 18O-enriched ocean

   https://doi.org/10.1038/s41561-020-0538-9  

   Johnson, Benjamin W.; Wing, Boswell A. (March 2020, Nature Geoscience)
3. Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas

   https://doi.org/10.1016/j.physletb.2017.09.039  

   Cirigliano, Vincenzo; Paris, Mark W.; Shalgar, Shashank (September 2017, Physics Letters B)
4. Impact of late-time neutrino emission on the diffuse supernova neutrino background

   https://doi.org/10.1103/PhysRevD.106.043026  

   Ekanger, Nick; Horiuchi, Shunsaku; Kotake, Kei; Sumiyoshi, Kohsuke (August 2022, Physical Review D)
5. Cosmological constraints on dark neutrino towers

   https://doi.org/10.1103/PhysRevD.111.015024  

   Anchordoqui, Luis A; Antoniadis, Ignatios; Lüst, Dieter; Peñaló_Castillo, Karem (January 2025, Physical Review D)

   We reexamine a dynamical dark matter model with Kaluza-Klein (KK) towers of gravitons and neutrinos fitting together in the dark dimension. We show that even though gravitational decays of neutrino KK towers have little impact in cosmology, the weak decay channel could have significant cosmological effects. Taking conservative upper bounds on the dark matter decay rate into two photons before reionization and on the number of effective extra neutrino species $\mathrm{\Delta }{N}_{\mathrm{eff}}$, we derive constraints on the conversion rate from active to sterile species despite the dependence of the mixing angle on the KK mode mass. We also provide counterarguments to a recent claim suggesting that the bounds on $\mathrm{\Delta }{N}_{\mathrm{eff}}$rule out micron-sized extra dimensions. Published by the American Physical Society2025 

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